|
| year | production | consumption |
| 1980 | 46.30 | 328.49 |
| 1981 | 54.01 | 281.09 |
| 1982 | 56.22 | 175.27 |
| 1983 | 40.79 | 227.08 |
| 1984 | 56.22 | 231.49 |
| 1985 | 46.30 | 317.47 |
| 1986 | 62.83 | 336.21 |
| 1987 | 68.34 | 256.84 |
| 1988 | 1,201.52 | 351.64 |
| 1989 | 2,342.41 | 372.58 |
| 1990 | 2,413.47 | 246.43 |
| 1991 | 2,397.84 | .68 |
| 1992 | 2,700.35 | 5.04 |
| 1993 | 4,205.25 | 42.98 |
| 1994 | 4,715.37 | 84.02 |
| 1995 | 4,480.05 | 7.96 |
| 1996 | 4,010.91 | 232.53 |
| 1997 | 5,672.53 | 52.02 |
| 1998 | 8,218.83 | 1,463.09 |
| 1999 | 7,693.16 | 55.38 |
| 2000 | 8,691.34 | 198.99 |
| 2001 | 8,361.41 | 74.34 |
| 2002 | 8,122.77 | 27.09 |
| 2003 | 7,503.43 | 65.04 |
| 2004 | 7,438.40 | 212.29 |
| 2005 | 7,930.58 | 55.31 |
| 2006 | 8,678.43 | 173.14 |
| 2007 | 6,720.42 | 209.34 |
| 2008 | 5,425.90 | 212.89 |
| 2009 | 3,617.52 | 357.73 |
| 2010 | 3,009.31 | 328.49 |
| 2011 | 2,503.35 | 220.46 |
|
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